Probably an nsec for that specific geocache only. I think you sign a note to yourself with that nsec, so you can prove you were there (since you were able to scan the QR with the nsec)
Hey nostr:nprofile1qqsgvxzpp84wjd7c6mucpd9qk3k6fmcdnql2meqracd5czmtmc3ck3cpz4mhxue69uhkg6t5w3hjuur4vghhyetvv9usdz6n9a - tell me it ain't so! 👀
Probably an nsec for that specific geocache only. I think you sign a note to yourself with that nsec, so you can prove you were there (since you were able to scan the QR with the nsec)
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